Added some tests

test/throttle/throttle.js

@@ -0,0 +1,21 @@
+const throttle = (fn, wait) => {
+let inThrottle, lastFn, lastTime;
+return function() {
+const context = this,
+args = arguments;
+if (!inThrottle) {
+fn.apply(context, args);
+lastTime = Date.now();
+inThrottle = true;
+} else {
+clearTimeout(lastFn);
+lastFn = setTimeout(function() {
+if (Date.now() - lastTime >= wait) {
+fn.apply(context, args);
+lastTime = Date.now();
+}
+}, wait - (Date.now() - lastTime));
+}
+};
+};
+module.exports = throttle